CN102808514B - Production method of large-span prestressed concrete hollow holed beam - Google Patents

Production method of large-span prestressed concrete hollow holed beam Download PDF

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Publication number
CN102808514B
CN102808514B CN201110145528.4A CN201110145528A CN102808514B CN 102808514 B CN102808514 B CN 102808514B CN 201110145528 A CN201110145528 A CN 201110145528A CN 102808514 B CN102808514 B CN 102808514B
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technology
construction
punches
span
concrete
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CN102808514A (en
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李华强
缪建国
朱成慧
李强
王成军
苏晓强
何政
周倩羽
吴亚澎
赵建雷
王双喜
鲁统
卢江华
郭瑞洪
梁杰
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Yongsheng Construction Group Co Ltd
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Yongsheng Construction Group Co Ltd
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Abstract

The invention discloses a production method of a large-span prestressed concrete hollow holed beam capable of accurately controlling technical parameters relative to rigidity of components in the premise that the opening ratio of a vertical section of the beam is fulfilled, that is to say, an opening area is more than 35%. The production method comprises an opening cracking resistance construction technology, a tall template support system construction technology, a holed mandrel locating and anti-floating technology, a prestress duct locating technology, a high-strength concrete self-compaction and vibration technology, and a bonded, unbonded and retard-bonded prestress technology. According to a method of holing on the vertical section of a beam body through construction of the large-span prestressed concrete hollow holed beam (the span is 27 m, the beam is 1.6 m high, a construction surface load is 13.9 kN/m<2>, and a centralized line load is 31.04 kN/m), the opening area is more than 35%. The production method appears for the first time at home and aboard, and the conventional method can bring huge technical risks and difficulties for construction. There is no relative literature report about researches and results of the construction technology of the prestressed concrete holed beam at home and aboard.

Description

The hollow beam preparation method that punches of large span prestressed concrete
Technical field
The present invention relates to International Classification of Patents patent classification E04B buildings in general structure; Especially the hollow beam preparation method that punches of large span prestressed concrete.
Background technology
In known technology, traditional beam longitudinal section punches with reserved, pre-buried steel sleeve pipe, and the section rate that punches is limited, and construction technology is simple.Particular/special requirement is not had to template, reinforcing bar and pre-stress construction.But for, the hollow beam construction that punches of large span prestressed concrete, such as span 27m, deck-molding 1.6m, working face load 13.9kN/m 2, concentration line load 31.04kN/m long-span beams construction time, if require to punch on beam body longitudinal section, and the area that punches accounts for more than 35%, and construction technology there is no precedent, there is huge technical risk and difficulty by traditional method construction.
Patents document discloses less, as application number 200820124604 concrete filled steel tubes-punching steel plate-combined concrete shear wall, belongs to a kind of shear wall.Concrete filled steel tube-punching steel plate-combined concrete shear wall is characterized in that: be made up of steel pipe concrete frame post (1) and steel plate concrete shear wall slab; The steel plate that shear wall is embedded punches, steel plate (2) both sides configure the steel mesh reinforcement be made up of transverse reinforcement (4) and longitudinal reinforcement (5), at the above-mentioned hole place punched with the steel mesh reinforcement socketing reinforcing bar (7) and socket steel plate (2) both sides.Not yet find simple and clear improvement opportunity that can be practical.
Summary of the invention
The object of this invention is to provide the hollow beam preparation method that punches of a kind of large span prestressed concrete, this construction method according to the designing requirement of girder construction, can meet under the parameter prerequisite such as structural loads and safety, completes the higher rate construction that punches.
Goal of the invention of the present invention is realized by following technical measures: to punch rate meeting beam longitudinal section, namely under the area that punches accounts for more than 35% prerequisite required, the technical data that accurate control is relevant to stiffness of structural member, comprising: hole cracking resistance constructing technology, high formwork support system construction technology, the core that punches are located with anti-floating technology, prestressed pore passage location technology, high-strength concrete self-compaction and technology of vibrating, had bonding, soap-free emulsion polymeization, retarded adhesive prestressed technology.
The invention has the beneficial effects as follows: hollow beam construction span 27m, deck-molding 1.6m, the working face load 13.9kN/m of punching of large span prestressed concrete 2, the way that punches on beam body longitudinal section of concentration line load 31.04kN/m, the area that punches accounts for more than 35%.At home and abroad still belong to the first time, bring huge technical risk and difficulty to construction.The punch research of construction technology of beam and achievement of prestressed concrete is at home and abroad also reported without pertinent literature.
Detailed description of the invention
Below in conjunction with detailed description of the invention, set forth the present invention further.
To punch rate meeting beam longitudinal section, the area that namely punches accurately controls the technical data relevant to stiffness of structural member, comprising under accounting for more than 35% prerequisite required:
1. hole cracking resistance constructing technology: by the setting of the cracking resistance reinforcing bar at hole place, the stability improving opening mould plate support system, the process control of reinforcement concrete vibrating, carry out the measures such as prestressed stretch-draw in time, ensure the object of structure of the window Crack Control; As the prestressed concrete beam of span 9m, punch 1100 × 900mm;
2. high formwork support system construction technology: to the primary structure intensity of template, formwork bracing system and section feature and every design load and Load Combination, the strength and stiffness of beam, plate formwork bracing system calculate, under beam slab, square bar stability calculates, vertical rod foundation bearing capacity checks, support system supporting layer checking of bearing capacity, conversion layer lower support layer checking of bearing capacity; As beam section 700 × 1600mm: span 27m, beam lower support height 9.5m, line load 31.04kN/m; Support system construction method main points comprise: beam, template die plate adopt 12 thick bamboo slab rubber, 50 × 100mm flitch, and scaffolding steel pipe installs, and vertical pole ' s span is 820mm.In work progress, the strict moment controlling fastening bolt, the screw-down torque of each fastening bolt controls at 45 ~ 60N.m, and steel pipe can not select the steel pipe of distortion; Apart from 0.2m place, ground at the bottom of column, bar of sweeping the floor is established by the program in vertical bottom rail in edge in length and breadth horizontal direction.The edge, column top in adjustable supporting backing portion arranges one girt in direction in length and breadth; The spacing of sweeping the floor between bar and top girt, meeting under stencil design determined girt stride requirements condition, is distributed equally after determining step pitch, at each step pitch place in length and breadth to respectively establishing one girt; Full hall template is in centre in length and breadth to establishing vertical bridging continuously from the bottom to top every about 9m (under Vierendeel girder), and its width is preferably 4 ~ 6m, and arranges horizontal cross brace at the top at bridging position, bar place of sweeping the floor.The bottom of bridging rod member should hold out against with ground, and angle is preferably between 45 ° ~ 60 °.The side form of beam adopts twice split bolt to fix, and split bolt level interval is 500mm.And outside split bolt, establish elongated pair of steel pipe solid with " 3 " shape clamping.According to designing requirement, the springing height of beam, plate is determined according to girder span L, and 27m, across arch camber 30mm, forbids anti-arch camber.
3. the core that punches location and anti-floating technology, adopt periphery to arrange mode that reinforcing bar shores carry out punching heart mould location and anti-floating is reinforced;
4. prestressed pore passage location technology; Lay corrugated conduit by drawing position, arrange along the both sides of crossbeam with 2-3 people, from one end, import bellows into, after pipe all imports into, two ends will be inserted in oriented oviduct, and the junction of bellows and oviduct is wound around and seals by blend compounds band, avoids spillage; Lay bellows and should follow following principle: when a, lay, strictly by design drawing and constructure scheme requirement location, size and rectilinear form should be ensured; B, oviduct location is wanted accurately; C, bellows lateral attitude must centrally line or be symmetrical in center line, and inaccurate to beat S curved; D, seal all connecting portions such as oviduct and bellows place, stretching end and reserve the position and steam vent termination of installing group's anchor; At various terminal place rubber belt sealing, must not spillage; E, in lay and after lay and in concreting process, forbid to touch flat and damage bellows, forbidding on bellows with gas welding;
5. high-strength concrete self-compaction and technology of vibrating; According to the self-compacting ability required for the design feature of the beam that punches, execution conditions and ambient conditions, on the basis that comprehensive strength, durability and other necessity require, carry out mix-design, mix-design adopts absolute volume method, wherein the maximum particle diameter of coarse aggregate is not more than 20mm, Water Usage Per Unit Volume is 155 ~ 180kg, and air content is 1.5% ~ 4.0%; Consider performance, Components Shape, the arrangement of reinforcement situation of self-compacting concrete during pumping, determine concrete speed of perfusion, maximum free height of fall when building should at below 5m, and maximum horizontal flow distance must not more than 7m;
6. there are bonding, soap-free emulsion polymeization, retarded adhesive prestressed technology.Retardation setting type prestress system combines the advantage of prestressing without bondn system and bonded prestress system, the same with soap-free emulsion polymeization system during construction, hardens gradually, reach the effect of bonded prestress system in using by the retarded adhesive material be wrapped on presstressed reinforcing steel.Retarded adhesive material also can block the passage of corrosive medium people Jie, serves certain protective effect to steel strand;
For span 27m, deck-molding 1.6m, working face load 13.9kN/m 2, concentration line load 31.04kN/m large span prestressed concrete hollow punch beam construction, beam body longitudinal section punches, and the area that punches accounts for more than 35%.
The embodiment of the present invention, when designing, requires development and the situation of change of fully understanding structural internal force and distortion, fully links up, cooperates, set up the mechanical model of Construction Analysis with designing unit; Conscientiously carry out Construction Course Analysis, mechanical analysis; Draft rational concrete according to analysis result to punch beam constructure scheme: the stability of large span, high form-tie assembly; Punch the construction measures such as size, prestressed pore passage location, core anti-floating location, arrangement of reinforcement location; Examination is joined, optimised coagulation soil match ratio, selection external auxiliary are vibrated, and guarantee the closely knit measure of core lower concrete; There are bonding, soap-free emulsion polymeization, slow cohesion three kinds of tension construction technology schemes: determine stretching force, stressing sequence etc.; Take rational constructure scheme and construction measure to ensure the stability of work progress high and big die plate support system, parameters that concrete punches beam and after being completed the position shape of structure and stress meet design requirement.In work progress, the parameters such as the position, duct of the size that punches, position, reinforcing bar and presstressed reinforcing steel are measured, record, analyzed, strict monitoring and dynamic correcting are timely carried out to work progress; In time enough section, the punch position shape of beam and stress of concrete is measured, records, analyzed according to plan after completion, determine that it meets design requirement.
Content of the present invention comprises the hollow beam that punches of large span prestressed concrete and relates to high and big die plate support system construction technology, steel concrete beam forms, reinforcing bar, concrete construction technology, post-tensioned prestressing construction technology.Be applicable to system support perfect, the modern large span public works of comprehensive pipeline complicated layout, has wide market application foreground.Can effectively save concrete, alleviate structural element deadweight, increase structural span and architectural space utilization rate, reduce construction investment.

Claims (1)

1. the hollow beam preparation method that punches of large span prestressed concrete, it is characterized in that: to punch rate meeting beam longitudinal section, namely under the area that punches accounts for more than 35% prerequisite required, the technical data that accurate control is relevant to stiffness of structural member, comprising: hole cracking resistance constructing technology, high formwork support system construction technology, the core that punches are located with anti-floating technology, prestressed pore passage location technology, high-strength concrete self-compaction and technology of vibrating, had bonding, soap-free emulsion polymeization, retarded adhesive prestressed technology; Wherein, hole cracking resistance constructing technology: by the setting of the cracking resistance reinforcing bar at hole place, the stability improving opening mould plate support system, the process control of reinforcement concrete vibrating, carry out prestressed stretch-draw measure in time, ensure the object of structure of the window Crack Control; High formwork support system construction technology: to the primary structure intensity of template, formwork bracing system and section feature and every design load and Load Combination, the strength and stiffness of beam, plate formwork bracing system calculate, under beam slab, square bar stability calculates, vertical rod foundation bearing capacity checks, support system supporting layer checking of bearing capacity, conversion layer lower support layer checking of bearing capacity; Beam section 700 × 1600mm: span 27m, beam lower support height 9.5m, line load 31.04kN/m; Support system construction method main points comprise: beam, template die plate adopt 12 thick bamboo slab rubber, 50 × 100mm flitch, and scaffolding steel pipe installs, and vertical pole ' s span is 820mm; In work progress, the strict moment controlling fastening bolt, the screw-down torque of each fastening bolt controls at 45-60Nm, and steel pipe can not select the steel pipe of distortion; Apart from 0.2m place, ground at the bottom of column, bar of sweeping the floor is established by the program in vertical bottom rail in edge in length and breadth horizontal direction; The column top in adjustable supporting backing portion arranges one girt along vertical or transverse direction; The spacing of sweeping the floor between bar and top girt, meeting under stencil design determined girt stride requirements condition, is distributed equally after determining step pitch, at each step pitch place in length and breadth to respectively establishing one girt; Full hall template is in length and breadth to establishing vertical bridging continuously from the bottom to top every about 9m under middle boxes is set a roof beam in place, and its width is 4-6m, and arranges horizontal cross brace at the top at bridging position, bar place of sweeping the floor; The bottom of bridging rod member should hold out against with ground, and angle is preferably between 45 °-60 °; The side form of beam adopts twice split bolt to fix, and split bolt level interval is 500mm; And outside split bolt, establish elongated pair of steel pipe solid with " 3 " shape clamping; According to designing requirement, the springing height of beam, plate is determined according to girder span L, and 27m, across arch camber 30mm, forbids anti-arch camber; The core that punches location and anti-floating technology, adopt periphery to arrange mode that reinforcing bar shores carry out punching heart mould location and anti-floating is reinforced; Prestressed pore passage location technology, corrugated conduit is laid by drawing position, arrange along the both sides of crossbeam with 2-3 people, bellows is imported into from one end, after pipe all imports into, two ends will be inserted in oriented oviduct, and the junction of bellows and oviduct is wound around and seals by blend compounds band, avoids spillage; Lay bellows and should follow following principle: when a, lay, strictly by design drawing and constructure scheme requirement location, size and rectilinear form should be ensured; B, oviduct location is wanted accurately; C, bellows lateral attitude must centrally line or be symmetrical in center line, and inaccurate to beat S curved; D, seal all connecting portions such as oviduct and bellows place, stretching end and reserve the position and steam vent termination of installing group's anchor; At various terminal place rubber belt sealing, must not spillage; E, in lay and after lay and in concreting process, forbid to touch flat and damage bellows, forbidding on bellows with gas welding; High-strength concrete self-compaction and technology of vibrating; According to the self-compacting ability required for the design feature of the beam that punches, execution conditions and ambient conditions, on the basis that comprehensive strength, durability and other necessity require, carry out mix-design, mix-design adopts absolute volume method, wherein the maximum particle diameter of coarse aggregate is not more than 20mm, Water Usage Per Unit Volume is 155 ~ 180kg, and air content is 1.5% ~ 4.0%; Consider performance, Components Shape, the arrangement of reinforcement situation of self-compacting concrete during pumping, determine concrete speed of perfusion, maximum free height of fall when building should at below 5m, and maximum horizontal flow distance must not more than 7m; There are bonding, soap-free emulsion polymeization, retarded adhesive prestressed technology, retardation setting type prestress system combines the advantage of prestressing without bondn system and bonded prestress system, the same with soap-free emulsion polymeization system during construction, use and harden gradually by the retarded adhesive material be wrapped on presstressed reinforcing steel, reach the effect of bonded prestress system; Retarded adhesive material also can block the passage of corrosive medium people Jie, serves certain protective effect to steel strand; For span 27m, deck-molding 1.6m, working face load 13.9kN/m 2the hollow beam construction that punches of the large span prestressed concrete of concentration line load 31.04kN/m, beam body longitudinal section punches, and the area that punches accounts for more than 35%.
CN201110145528.4A 2011-06-01 2011-06-01 Production method of large-span prestressed concrete hollow holed beam Active CN102808514B (en)

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CN110607841B (en) * 2019-10-18 2021-10-15 中国建筑第八工程局有限公司 Wind tunnel prestress construction process

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101057038A (en) * 2004-09-25 2007-10-17 韩万烨 Hollow prestressed concrete (HPC) girder and spliced hollow prestressed concrete girder (S-HPC) bridge construction method
CN201809897U (en) * 2010-03-19 2011-04-27 柳忠林 Large-span prestress concrete beam slab used as ventilation passage and ventilation passage system

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JP2004316322A (en) * 2003-04-18 2004-11-11 Takenaka Komuten Co Ltd Construction method of column-beam skeleton by precast concrete member

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101057038A (en) * 2004-09-25 2007-10-17 韩万烨 Hollow prestressed concrete (HPC) girder and spliced hollow prestressed concrete girder (S-HPC) bridge construction method
CN201809897U (en) * 2010-03-19 2011-04-27 柳忠林 Large-span prestress concrete beam slab used as ventilation passage and ventilation passage system

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* Cited by examiner, † Cited by third party
Title
JP特开2004-316322A 2004.11.11 *

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